Final Information To Amazon Stock Efficiency Index (IPI) 2021


Stock Administration is without doubt one of the most vital elements behind an FBA vendor’s success. It could make or break their Amazon enterprise. By studying efficient inventory management techniques, one can cut back storage charges, stock prices and enhance their total revenue margin. 

To assist sellers measure the well being of their stock, Amazon has developed a metric often called Amazon Stock Efficiency Index(IPI) – it’s based mostly on how effectively you’ll be able to generate gross sales by stocking trending merchandise and optimizing on-hand stock on the similar time. 

So, earlier than we bounce proper into the best Amazon IPI rating 2021 and its threshold, allow us to first perceive what precisely the IPI rating is, how it’s calculated, and what impacts your IPI Rating efficiency. So, let’s get started- 

Subjects to be lined: 

  1. What is an Inventory Performance Score
  2. How to check Amazon’s IPI score?
  3. How is Amazon IPI calculated?
  4. Amazon IPI threshold
  5. Factors affecting IPI Score
  6. What happens when your IPI score goes below the threshold?
  7. How to improve Amazon’s IPI score?

What’s the Stock Efficiency Index?

IPI was launched in 2018 to gauge stock ranges and set inventory limits to assist underperforming Amazon sellers enhance their enterprise trajectory by figuring out the areas of enchancment in inventory management.

In accordance with Amazon, the Stock Efficiency Index measures your stock well being and income, it additionally takes into consideration how effectively you repair your product itemizing issues equivalent to conserving standard merchandise in inventory and eradicating unavailable merchandise out of your listings.

Stock well being is set by the variety of items current your stock has – having very low items of stock results in out-of-stock gadgets and misplaced gross sales. Alternatively, having extra items of stock results in greater holding and storage prices.

Step one in setting an ordinary on Amazon sellers’ Stock Efficiency is to investigate the IPI rating. It ranges from 1 to 1000 – the extra, the higher.  

Amazon’s IPI Rating is useful to each sellers and Amazon. Efficient administration of stock will cut back misplaced gross sales and stock holding prices for sellers. This additional permits Amazon to optimize its huge warehouse community as sellers inventory the inventories with the correct merchandise in the correct portions.

Methods to examine Amazon IPI Rating? 

You possibly can view your present rating in your Inventory Dashboard within Seller Central. Be sure to have an lively Vendor Central account to entry your IPI Rating. 

Your IPI consists of its personal dashboard. To view it- 

Log in to Vendor Central. 

amazon inventory performance index 2021

Click on on Stock and choose Stock Planning from the drop-down menu.

how is amazon ipi calculated

Click on on the Efficiency tab to view your IPI rating.

factors affecting ipi score

Click on on EXPAND STORAGE MONITOR tab on the backside of the web page.

On the Stock Efficiency Dashboard, Amazon facilitates sellers to extend their IPI rating with the assistance of those three steps –

  • Extra Stock suggestions for optimizing holding, storage, and carrying prices.
  • Restock options for enhancing in-stock price.
  • Present actionable insights on stranded stock gadgets to make sure the supply of product listings.

Your IPI rating is up to date weekly – each Monday, based mostly in your newest 3-months efficiency stats.

How is Amazon’s IPI Calculated? 

The components for calculating IPI scores continues to be a secret. When Amazon was requested how they calculate the IPI rating, they responded “The calculation is proprietary and won’t be printed, simply as we don’t publish the Purchase Field algorithm.

Amazon clearly mentions that “IPI factors aren’t deducted for operating out of inventory”. Due to this fact, out-of-stock gadgets won’t negatively impression your IPI rating. 

Stranded stock could impression your IPI rating however sellers can repair this drawback simply. Due to this fact, merely put, the important thing elements that enhance your IPI Scores are – 

In accordance with Amazon, “The easiest way to extend your IPI rating and reduce your FBA storage fees is to scale back unproductive stock and hold your product stock at lean ranges whereas making certain you will have sufficient available to attenuate misplaced gross sales.”

Amazon IPI Rating Threshold 2021

Amazon units a minimal IPI rating threshold that each one sellers will need to have to keep away from excessive storage prices. In case your rating drops beneath that threshold, Amazon will apply storage limits in your vendor central account till any additional enchancment in your stock ranges. 

In 2020, Amazon modified the Stock Efficiency Index (“IPI”) minimal threshold to 500 and launched ASIN-level amount limits on product listings of FBA sellers. This minimal threshold requirement was additional modified in 2021.

Now sellers beneath 450 IPI rating will likely be topic to storage limits efficient. This implies something above 450 IPI rating is taken into account a very good rating, and FBA sellers with this rating must pay fewer storage prices and get extra cupboard space. 

Amazon computes your IPI each Monday based mostly in your three months efficiency knowledge. The most effective half about your IPI rating calculation is that Amazon will inform you in the event you nonetheless have time to extend your IPI rating earlier than they set storage limits. 

In the event you rating above the edge of 450 throughout two consecutive rating examine weeks, you’ll have entry to limitless cupboard space for every storage type (footwear, attire, aerosol, oversize, standard-size, flammable). 

Components affecting IPI Rating

Regardless that Amazon doesn’t declare the components for commuting IPI rating, it does tells us what are the elements that affect your IPI rating and what you are able to do about it. 

At present, there are 4 elements that affect your IPI rating – 

  • Extra stock % supplies you insights into your extra inventory unit proportion.
  • Stranded stock % refers back to the variety of items that aren’t actively listed on Amazon, this additional results in extra storage prices.
  • FBA sell-through price refers back to the variety of items bought which can be in inventory.
  • FBA in-stock price signifies how effectively you handle your in-stock replenishable gadgets.
Extra Stock % Stranded Stock % Promote-through Price In-Inventory Price
Extra items X 100 / Complete items Inactive itemizing items X 100 / Complete items Items bought / Shipped over 90 days/ Complete items in inventory obtainable from the previous 90 days ST1 = Inventory Time for SKU 1
ST2 = Inventory Time for SKU 2
SV1 = Gross sales Velocity for SKU 1
SV = Gross sales Velocity for SKU 2

[(ST1 * SV1) + (ST2 * SV2)] / (SV1 + SV2)

Extra Stock 

One of many greatest facets that influences your IPI rating is your extra stock. As it’s already recognized that Amazon prefers to be the achievement heart for sellers and never the cupboard space facilitator. Due to this fact, its first precedence is to maneuver stock gadgets from warehouses to prospects’ doorsteps shortly.

Amazon declares an merchandise to be “extra” or “overstock” when the proportion of FBA stock items exceeds a 90-days provide, relying on its demand prediction. 

A wise step could be to take care of a list of roughly 30-60 days’ value of provide to stop overstocking. Amazon supplies sellers with actionable insights into product demand and restocks on their Stock Dashboard. 

For instance, in case your stock inventory is far more than what it ought to be, Amazon will inform you the variety of extra items your stock has and what it’s essential to do with that extra stock. 

Amazon additionally supplies you an in depth perception on three different metrics to additional perceive your extra stock situation: 

  • Extra Items: The variety of items that incur extreme storage charges and yield no income. It’s decided by the shopper demand for that product and its value of manufacturing. 
  • Estimated Complete Storage Price: Complete storage value to be incurred by you over Three years if you don’t steadiness your stock ranges now and let it keep idle within the achievement heart.
  • Scale back Extra Stock: This shows what number of of your SKUs have extra stock items. 

FBA Promote-By means of Price 

Your sell-through price relies on the variety of items bought and shipped over the previous 90 days out of your complete stock shares obtainable on the achievement heart from the previous 90 days.

Amazon’s stock dashboard additionally helps sellers by offering actionable insights into how one can enhance your sell-through price and cut back long-term storage charges. 

Click on on “Enhance sell-through” to land on the “FBA Stock Age” web page. 

Right here, you will discover every of your merchandise with a low sell-through price, gross sales rank, gross sales over 90 days, obtainable stock, stock storage period, and approximate long-term storage prices. 

Additionally, you will discover correct suggestions on methods to enhance your low sell-through price and cut back long-term storage prices.

Stranded Stock 

Stranded stock refers back to the variety of items saved in your stock with no lively supply for that merchandise attributable to itemizing issues. Because of this prospects won’t be able to purchase that merchandise, inflicting the vendor to incur greater storage charges and misplaced gross sales. 

The excellent news is this isn’t a really grave difficulty and sellers can resolve it simply, as Amazon will present an in depth overview of your stranded stock items and proposals on methods to repair them. 

You probably have stranded stock, you’ll be able to view a Warning button that claims “Repair listings” in your stock efficiency dashboard. 

If you choose “Repair listings,” it can navigate you to the “Repair stranded stock” web page. Right here, Amazon will show all of the stranded inventories, point out the variety of items stranded and if they’ve an auto-removal date, it can present the reason for the stranded stock, and an choice to relist them.

In-Inventory Stock 

Amazon displays your efficiency relying on how successfully you inventory standard ASINs. Whereas this metric doesn’t impression your IPI rating negatively, it could certainly result in some enhancements to your rating.

Amazon takes into consideration the period of time your listings have been in inventory throughout the previous 30 days, with extra significance given to merchandise which were bought extra over the previous 60 days. In the event you guarantee a excessive in-stock stock is maintained, you’ll be able to cut back your misplaced gross sales alternatives too.

What occurs when your IPI rating goes beneath the edge?

In case your Amazon IPI rating drops beneath the minimal threshold of 450, you’ll be topic to inventory storage limits. It is possible for you to to search out your retailer and new restock limits by navigating to “Stock efficiency” or “Handle FBA shipments.”

In case your Stock Efficiency Index is beneath 350, 6 weeks earlier than or throughout the finish of the quarter, then Amazon restricts you to inventory extra stock and imposes a $10/cu ft high-quality on any extra items saved in your stock. 

The penalties are normally extreme and will incur hefty storage charges and result in misplaced Amazon gross sales, therefore, it’s essential so that you can monitor your stock efficiency index (IPI) often. 

Methods to enhance your IPI Rating?

There are few normal suggestions on enhancing your IPI Rating. They’re: 

Enhance your sell-through price

If you’re an Amazon vendor, it’s essential to keep a 90-day sell-through price that provides you a heads up within the IPI graph with the “inexperienced” shade mark. 

You possibly can enhance your sell-through price by operating sponsored ad campaigns, enhancing your itemizing technique, enhancing your key phrase focusing on, and conducting detailed product research to search out essentially the most trending merchandise that resemble your itemizing class. 

Scale back extra stock

Take away gadgets which can be not in demand or yielding you any income. Go to the “Handle Stock Web page” in your stock dashboard to search out suggestions on how one can sort out extra stock.

Keep away from long-term storage charges

Take away any stock inside 365 days of its sitting in Amazon’s achievement heart. In case your stock sitting period has reached past 365 days, you’ll be subjected to hefty long-term storage charges. You can also make a removing order and even enable Amazon to do away with your stock.

Keep on Prime of Itemizing Points

You probably have stranded stock or another itemizing issues that hinder your sale, it’s time to get proactive along with your listings. It’s essential to: 

  • Monitor your stranded stock proportion 
  • Optimize stock ranges 
  • Scale back extra stock over a 90-days provide interval
  • Prioritize your standard stock gadgets – hold them between 30-60 days provide interval. 
  • Observe your stock dashboard often. 


In the event you can optimize your stock ranges effectively, no person can cease you from growing your revenue margins. If you’re a brand new vendor and can’t predict the demand correctly, ship in a small proportion of FBA stock to investigate your itemizing’s gross sales velocity on Amazon.

It takes a very good period of time and expertise to lastly perceive the correct quantity of stock items important for every of your ASINs. Take note of the actionable insights that Amazon supplies to stop overstocks and cut back hefty storage prices.